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   Technical Description Accessories
Ericsson Handheld Telephone 1341-B
    Vehicle Power Adaptor VP2000

                 Contents



Introduction ___________________________________________ 3
Main Features _________________________________________ 3
Power Supply ____________________________________________ 3
Charging ________________________________________________ 5
Specifications_________________________________________ 6
Connectors and Signals ______________________________ 6
System Connector J1 ______________________________________ 6
Power Connector J2 _______________________________________ 7
Technical Description Accessories: VP2000




2
                               Technical Description Accessories: VP2000



Introduction

        The Vehicle Power Adaptor VP2000 is plugged into the 12 V cigarette lighter
        outlet and provides power to the telephone at the same time as it charges the
        telephone battery.

        The Vehicle Power Adaptor consists of three parts; the plug which contains
        the electronics, the coiled cord and the detachable connector part.




Main Features

        Power Supply
        The logic in the telephone controls the power supply. The current values
        needed by the telephone in different situations, for example in standby or in
        transmission, are programmed and stored in the telephone.
        The VP2000 delivers two current levels only, 700 mA and 30 mA. These lev-
        els are pulsed during a 30 seconds period to enable any average level to be
        achieved.
        Every 30 second period begins with a 700 mA pulse and ends with a 30 mA
        pulse. The length of 700 mA pulse decides the average current.




                                                                                        3
Technical Description Accessories: VP2000



              Examples:
              Standby: 700 mA for 4 seconds gives 4s / 30s x 700 = 93 mA




              Transmission: 700 mA for 25 seconds gives 25s / 30s x 700 = 583 mA




              The battery of the telephone takes care of the redundant current during the
              700 mA part and support with extra current during the 30 mA part. This means
              a battery always has to be attached to the phone when it is connected to
              the Vehicle Power Adaptor.




              Note: To trickle-charge the battery the actual value of the current is set some
              mA higher than the current required.



4
                       Technical Description Accessories: VP2000



Charging
The batteries used are of the type nickel metal hydride, NiMH. There are
four contacts on the battery: plus, minus, T and K. The contact T is used for
the temperature sensor. K is not used.

When the telephone is connected to the charger and switched ON, the battery
condition is analyzed. If charging is decided, 700 mA is delivered constantly.
During the charging the voltage and the temperature increase and follow the
curve as shown in the figure below.




The battery voltage and the temperature are measured every second. A mean
voltage value and a mean temperature value, are calculated every minute.
These minute values are compared according to the following methods:

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